<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>test</title>
    <style>
        .wrapper {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            width: 500px;
            padding: 10px;
            border: 1px solid #aaa;
        }
        .item {
            width: 100px;
            height: 100px;
            line-height: 100px;
            text-align: center;
            border: 1px solid #ccc;
            margin: 10px;
        }
    </style>
</head>
<body>
    <div class="wrapper watermark">
        <div class="item">1</div>
        <div class="item">2</div>
        <div class="item">3</div>
        <div class="item">4</div>
        <div class="item watermark">5</div>
        <div class="item">6</div>
        <div class="item">7</div>
        <div class="item watermark">8</div>
        <div class="item">9</div>
        <div class="item">10</div>
        <div class="item">11</div>
        <div class="item">12</div>
    </div>
    <script type="module" src="./test.js"></script>
</body>
</html>